﻿/* Copyright (c) 2010 EPiServer AB
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
 * to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
 * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
using System;
using System.Text;
using System.Web;

namespace EPiServer.Municipality.Web {
    public class InitializerModule : IHttpModule {
        /* *******************************************************************
        *  Methods 
        * *******************************************************************/
        #region public void Init(HttpApplication context)
        /// <summary>
        /// 
        /// </summary>
        /// <param name="context"></param>
        public void Init(HttpApplication context) {
            context.ReleaseRequestState += InitializeResponseFilter;
        }
        #endregion
        #region public void Dispose()
        /// <summary>
        /// Releases the resources used by the <b>InitializerModule</b>.
        /// </summary>
        public void Dispose() {
        }
        #endregion

        /* *******************************************************************
        *  Event methods 
        * *******************************************************************/
        #region private void InitializeResponseFilter(object sender, EventArgs e)
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void InitializeResponseFilter(object sender, EventArgs e) {

            var application = (HttpApplication)sender;

            if (application.Context.Request.Url.AbsolutePath.StartsWith(UriSupport.UIUrl.AbsolutePath, StringComparison.CurrentCultureIgnoreCase))
                return;

            //get the current encoding
            Encoding currentEncoding = application.Context.Response.ContentEncoding;

            //if the encoding emits preamble, and it's utf8, replace it with a preamble less encoding
            if (currentEncoding.GetPreamble() != null && currentEncoding.GetPreamble().Length > 0 && currentEncoding is UTF8Encoding)
                currentEncoding = new UTF8Encoding(false);

            if (application.Context.Response.ContentType.ToLower() == "text/html")
                application.Context.Response.Filter = new StrictFilter(application.Context.Response.Filter, currentEncoding);
        }
        #endregion
    }
}